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Measurement of phase transformations in steel using electromagnetic sensors.

Papaelias, M. P. H. and Strangwood, M. and Peyton, A. J. and Davis, C. L. (2002) Measurement of phase transformations in steel using electromagnetic sensors. Journal of Ironmaking and Steelmaking, 29 (6). pp. 469-476. ISSN 0301-9233

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Abstract

An electromagnetic (EM) sensor, capable of detecting the formation of ferromagnetic ferrite from paramagnetic austenite below the Curie temperature, has been developed and assessed. The long term aim of this work is to develop a method for monitoring microstructure online during strip steel processing. In the present paper, the initial results of variation in trans-impedance with microstructure obtained for three different types of steel with varying carbon contents are discussed. It was found that the EM sensor can successfully detect the formation of ferrite below the Curie temperature, but trans-impedance values are affected by the presence of a decarburised ferrite ring that forms around the specimens tested in a furnace. It was also found that the trans-impedance value is monotonically (non-linearly) related to ferrite volume fraction, and depends on the morphology and distribution of the ferromagnetic phase and, hence, is influenced by the prior austenite grain size.

Item Type: Article
Journal or Publication Title: Journal of Ironmaking and Steelmaking
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 20224
Deposited By: ep_ss_importer
Deposited On: 19 Dec 2008 10:58
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:37
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/20224

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